JPH05501440A - A valve that measures and mixes vaporized fuel into the fuel mixture of an internal combustion engine. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] A valve that measures and mixes vaporized fuel into the fuel mixture of an internal combustion engine. Background technology The invention provides a method for extracting gas from a fuel tank of an internal combustion engine, of the type defined in the preamble of claim 1. The emitted fuel is metered and mixed into the fuel mixture supplied to the internal combustion engine via the intake pipe. Regarding the valve that adds

In some countries, legal provisions for environmental protection require that vaporization in fuel tanks is prohibited. fuel, so-called gasoline vapor, must not be released into the atmosphere and must not be used in internal combustion engines. must be combusted by introduction into the For this purpose, exhaust the fuel tank A tube piece is connected to a reservoir filled with activated carbon, which is used in an internal combustion engine. When the internal combustion engine is stopped, the volatilized fuel is stored, and when the internal combustion engine is running, this fuel is recycled. discharge. For this, the reservoir is connected to the intake pipe of the internal combustion engine via the intake conduit. The fuel vapor is added to the fuel mixture at this location. This causes Due to the possible increase in exhaust gas emissions, fuel vapor is Moreover, it is necessary to mix it in a specified amount. I would like to mention this at the beginning. This is done using a tank exhaust valve. This tank exhaust valve connects the reservoir and suction pipe. arranged in the suction conduit between the Moreover, the operating state of the internal combustion engine and 0. Exhaust gas emissions measured by sensors They are opened or closed depending on the amount of output. internal combustion engine It is integrated into the tank exhaust valve to prevent after-intake of the internal combustion engine when the engine is stopped. The inserted seat valve is configured to close without current. electromagnet mover The dual function of the annular valve member, which also forms a This also enables short switching times for the seat valve.

In such a tank exhaust valve, the stroke of the valve member is determined by the pressure upstream of the valve seat and the pressure downstream of the valve seat. It is desirable to adapt the pressure difference between the side pressure and It decreases when the combustion engine is idling (large pressure difference), and the load on the internal combustion engine decreases. As the pressure increases (pressure difference decreases), the stroke gradually increases. ing. This stroke adjustment and the predetermined timing caused by it A large pressure difference ( When controlling a small passing amount during idling operation of an internal combustion engine, it is necessary to Accuracy is obtained. Such control controls small throughputs in a constant valve stroke. This electromagnet eliminates the extremely short switching times required when This allows for a compact and lightweight structure.

Such a stroke adjustment can be carried out using known tank exhaust valves of the type mentioned at the outset (Germany). In Japanese Patent Application Publication No. 3844453), two valves with valve openings are provided. A valve seat with a seat is configured in an intermediate ring that is tightened to the casing, and this A bellows is fixed with one end face thereof to the side of the intermediate ring facing the inlet tube piece. and the other end face of the bellows extends over the bellows at a radial distance. This is achieved by being fixed to the bottom of the surrounding pot. of the pot The pot edge transitions radially into an annular collar that projects beyond the annular valve opening. . This annular collar has a predetermined number of axial holes distributed circumferentially. . These axial holes are axially aligned with the valve opening. The intermediate ring The seat facing the seat has a sealing seat that surrounds the valve opening on the inside and outside.

This sealing seat is adapted to cooperate with an annular collar serving as a closure member of the pot. ing. As the negative pressure in the inlet tube increases, the bellows contracts. Said The annular collar is close to the seal seat, and the flow cross-sectional area at the seal seat is small.

The limit has been reached when the annular collar of the pot rests on the seal seat. annular brim The axial bore provided in the seat valve defines the remaining open cross-sectional area of the seat valve.

Such a construction of a tank exhaust valve is structurally extremely complex and therefore relatively This requires high manufacturing costs.

Advantages of invention The tank exhaust valve according to the invention according to the characterizing part of claim 1 has a valve The valve member stroke is sufficiently adapted to the pressure difference between the upstream side and the downstream side of the seat. , a seat valve that is closed in the absence of current can be realized with only a small amount of manufacturing effort. This is an advantage.

Due to the nozzle action of the annular gap nozzle, the negative pressure in the intake pipe of the internal combustion engine increases. As the pressure increases, and thus the negative pressure in the outflow pipe piece of the tank exhaust valve increases. As a result, the valve member or movable element is increasingly sucked toward the valve seat holding the two seats. be caught. This suction force acts against the force of the electromagnet. An annular gear is attached to the return path forming yoke. Separate valve seat support is saved due to the integral integration of the cap nozzle This makes the valve cheaper. Based on the suction action of the annular gap nozzle , the valve closing spring acting in the suction direction can also be dimensioned extremely small. . Threaded connection between magnet core and magnet casing allows easy axial sliding of the magnet core and thus also an extremely simple adjustment of the stroke stop for the armature. Advantageous improvement of the tank exhaust valve according to claim 1 is possible by the structure of claim 2 and subsequent claims. become.

In an advantageous embodiment of the invention, the annular gap nozzle is provided on the return-forming yoke. It is placed at the bottom of the recess, and the valve member or mover is placed at a small distance in the radial direction. A plate, preferably made of a non-magnetic material, held in the valve casing is placed in the recess with the It is slidably guided in the axial direction by a spring. This allows easy movement of the mover. A guide is secured. The leaf spring allows the movable element to tilt laterally due to magnetic force. It is designed to be blocked.

The volatilized fuel flowing from the inlet piece through the seat valve to the outlet piece is In a further advantageous configuration, a hollow cylindrical magnet core also provides a connection between the magnet housing and the valve housing. It is also guided by an axial passage between it and the housing. This allows the electromagnet to The heat generated during timing operation is better dissipated.

When using the tank exhaust valve in a so-called supercharged engine, it should be directed toward the outlet pipe piece. A check valve that opens once is required. Such a check valve is a further configuration of the present invention. is easily integrated into the valve casing between the valve seat and the outlet pipe piece. check valve The valve seat is arranged in the valve casing, and the valve member is arranged in a valve spring supported on the outflow pipe piece. Therefore, it is pressed against the valve seat.

drawing In the following, embodiments of the invention will be explained in detail with reference to the drawings.

Figure 1 is a longitudinal sectional view of the tank exhaust valve, and Figure 2 is the tank exhaust valve shown in Figure 1. Fig. 3 is a vertical cross-sectional view of a return path forming yoke of an electromagnet provided in the yoke shown in Fig. 2; FIG. 3 is a plan view of a return path forming yoke.

Description of examples Figure 1 shows how fuel vaporized from the fuel tank of an internal combustion engine is transferred to the internal combustion engine through the suction pipe. A longitudinal section through a valve for metering the fuel mixture supplied to the engine is shown.

In the following this valve will be referred to as tank exhaust valve. This tank exhaust valve is from the Federal Republic of Germany As described in Japanese Patent Application Publication No. 3519292, the volatilized Used in discharge units for introducing fuel into internal combustion engines. this tank The exhaust valve has a two-part valve casing 10. In other words, this valve The casing includes a pot-shaped casing part 101 and a pot-shaped casing part 101. It has a cap-like casing part 102 that closes the part. Casing part 101 holds an inlet tube piece 11, which inlet tube piece fires said tank exhaust valve. Connect to the exhaust pipe piece provided on the fuel tank or located downstream of the fuel tank. to connect to the reservoir for the volatilized fuel, which is filled with activated carbon. Helpful. On the other hand, the casing part 102 is for connecting to the intake pipe of the internal combustion engine. The outflow tube piece 12 is held. The inflow pipe piece 11 and the outflow pipe piece 12 are each axially It is arranged in the casing part 101:102 in the direction. Pot-shaped casing part Inside the portion 101, a t[stone 13 is placed. This electromagnet is a pot-shaped magnet. A stone casing 14 and a coaxial hollow cylindrical magnet core 15 passing through the bottom of the pot. and a cylindrical excitation coil 16. This excitation coil is coil support 1 7 and is fitted into the magnet casing 14 so as to surround the magnet core 15. ing. At the bottom of the magnet casing 14 is an outwardly projecting threaded tube piece 18. It is integrally molded. This threaded tube piece is provided with an internal thread 19, which The thread has a male threaded section 20 provided in the hollow cylindrical magnet core 15. are combined. By rotating the magnet core 15, this magnet core is attached to the magnet casing 1. 4 in the axial direction. The magnet core 15 is aligned with the inflow tube piece 11. Therefore, the inflowing volatilized fuel directly flows into the magnet core 15 and Flow through the stone core. The magnet casing 14 with the magnet core 15 is a pot-shaped casing. In this case, the outer peripheral wall of the magnet casing 14 and An axial passage remains between the valve casing 10 and the inner peripheral wall thereof. This axial passage is circumferential are shifted from each other by the same angle. The longitudinal cross-sectional view in Figure 1 shows Two axial passages 21, 22L located opposite are not recognized. Axial direction The passages 21,22 are connected to the externally threaded section of the valve casing 10 and the magnet core 15 on the one hand. It is connected to the inlet tube piece 11 via the annular chamber 23 remaining between the minute 20 and the other In this case, near the open end of the magnet casing 14 ( The magnet casing 14 is connected to the inside of the magnet casing 14 through a hole 24 . The axial passage Through channels 21, 22, the volatilized fuel flowing out of the inlet pipe piece 11 enters the magnet case. The heat generated at this location is transferred to the electromagnet casing 14. The edges are folded outward to form an annular support flange 25. .

This support flange is bent at the end and has an axially projecting annular web 26. is formed. The support flange 25 serves to accommodate the return path forming yoke 27 .

This return path-forming yoke covers the magnet casing 14 and has an annular groove on the edge side. 26. Figures 2 and 3 show the results enlarged in cross-sectional view and plan view. The channel-forming yoke 27 is connected to the cap-shaped casing part 1 by means of two fitting holes 28. It is mounted on two holding bins 29 provided in 02. These holding bins It protrudes in the axial direction on the lower side facing the singe portion 101. pot-shaped casing When locking the cap-shaped casing part 102 to 101, the return path forming yaw The hook 27 fits snugly into the support flange 25 with the annular web 26 and The clamping is fixed to the support flange of. In this case, the support flange 25 and the return path Further, a leaf spring 3 made of a non-magnetic material, for example bronze, is disposed between the plate spring 3 and the yoke 27. 0 is tightened, and this leaf spring is centered on the holding pin 29. .

It supports the movable element of the electromagnet 13.

The electromagnet 13 causes a seat valve 31 arranged between the inflow pipe piece 11 and the outflow pipe piece 12 to Works to control at predetermined timing. The seat valve 31 is a valve seat 3 having two seats. 2 (FIG. 2), and this valve seat is connected to the inflow pipe piece 11 of the return path forming yoke 27. It is arranged at the bottom of the recess 33 provided on the side facing. The recess 33 is The bottom portion of the portion 33 that holds the valve seat 32 is configured to face the magnet core 15. Ru. The valve seat 32 coaxially surrounds an annular gap nozzle 34 on the inside and outside. This annular gap nozzle has two semicircular symmetrical arch gaps 35. ．． 36 is configured on the return path forming yoke 27. Is the valve seat 32 made of magnetic material? It cooperates with a valve member in the form of an annular plate 37 consisting of. This annular plate also allows the electromagnet 13 to It also forms the movement.

The annular plate 37 engages the leaf spring 30 at a centering portion 38 formed by a circular notch 39. The six annular plates 37 fixed to this leaf spring have an axial thickness of is formed slightly smaller than the inner depth of the recess 33, and the diameter of the annular plate is also smaller than the inner depth of the recess 33. Since the dimensions are set so that it is formed slightly smaller than the inner diameter of the portion 33, There is an extremely small annular gap between the outer peripheral surface of the annular plate 37 and the inner peripheral surface of the recess 33. Only 40 remain. The leaf spring 30 has reliable magnetic tilting on the sides of the annular plate 37. It is designed to be blocked. The annular plate 37 has a side facing the valve seat 32. It supports the seal rubber 41. In the closed state of the seat valve 31, the annular plate 37 On the side covered by the seal rubber 41, pressure is applied to the valve seat 32 by a valve closing spring 49. be feasted on. For this purpose, the valve closing spring 49 is supported on the annular plate 37 on the one hand; On the other hand, it rests on an annular support shoulder 50 . This support shoulder is a hollow cylindrical magnetic It is constructed on the inner wall of the stone core 15. The free end surface of the magnet core 15 is lined with the annular plate 37. A stopper 51 is formed for the movement. Division with female thread 19 and male thread The stopper 51 is moved in the axial direction using the adjusting screw thread formed by the This allows the flow rate at the seat valve 31 that is opened to the maximum to be regulated. can be determined. The valve closing spring 49 is dimensioned small. The reason is , in the pressure gradient between the outlet tube piece 12 and the inlet tube piece 11, the annular gap nozzle 34 exerts a suction effect on the annular plate 37 in the direction of valve closing. Sunawa In other words, the annular gap nozzle assists the closing action of the valve closing spring 49.

The back surface of the return path forming yoke 27 on the side opposite to the valve seat 32 is sealed by a seal ring 42. Since the return path forming yoke 27 is sealed against the casing portion 102, Leakage losses are prevented over the entire connection between magnet casing 14 and magnet casing 14. outflow pipe The piece 12 is engaged in a receiving tube piece 43 coaxially molded on the casing part 102. There is. In this housing tube piece 43, a check valve 45 is provided on the annular shoulder projecting radially inward. A valve seat 44 is configured. A valve body 46 is pushed onto this valve seat by a valve spring 47. be pressured. The valve spring 47 is supported by a receiver 48 provided on the receiving tube piece 43.

This check valve 45 is used as a tank exhaust valve in a so-called supercharged engine. If necessary.

The mode of operation of the tank exhaust valve explained above is as follows. , the seat valve 31 is closed. This is because the annular plate 37 is made of its seal rubber 41. This is because the valve closing spring 49 presses the valve seat 32 against the valve seat 32 . Internal combustion engine operation At times, electromagnet 13 is timed by an electronic controller. In this case, Since the timing cycle is determined by the operating state of the internal combustion engine, the inflow pipe piece 11 The flow rate of the volatilized fuel flowing into the outflow pipe piece 12 through the seat valve 31 is adjusted accordingly. is measured. Such electromagnetic control of the seat valve 31 controls the suction of the annular gap nozzle 34. This is superimposed by influencing the travel of the annular plate 37 due to the compression effect.

Outflow pipe piece 12 and inflow pipe such that the maximum value is reached during idling operation of the internal combustion engine. The greater the pressure difference between the annular gap nozzle 34 and the The suction force acting on the annular plate 37 against the force of the electromagnet 13 increases. As the load on the internal combustion engine increases, the suction in the outlet pipe piece 12 becomes thicker and thicker. The filling pressure decreases and is at a minimum at full load. Inflow pipe piece 11 and outflow pipe piece 12 The pressure difference between is small and the suction effect of the annular gap nozzle 34 is correspondingly small. Become. When the electromagnet 13 is excited, the annular plate 37 moves all the way to the stopper 51. implement. In this case, the flow rate through the open cross section is determined by the adjusting screw threads 19, 20. This can be adjusted by rotating the magnet core 15 in .

The invention is not limited to the embodiments described.

That is, instead of centering the leaf spring 30 in the casing part 102, , with a return path forming yoke 27 by means of a similar bin.

Two Special table 15-501440 (5) N fishing book The tank exhaust valve that measures and mixes the vaporized fuel into the fuel mixture of the internal combustion engine is a valve case. The valve casing (10) has an inlet tube piece (11). and an outflow pipe piece (12). There is an electromagnetic connection between the inflow pipe piece and the outflow pipe piece. An actuated seat valve (31) is arranged, and this seat valve is closed by a valve closing spring (49). and is loaded in the closing direction. To simplify the structure of the tank exhaust valve In this case, the valve opening of the seat valve (31) serves as an annular gap nozzle (34), and the electromagnet (13) ) is arranged on the return path forming yoke (27) of the annular gap nozzle (37). ) a valve seat (32) having two seats surrounding the valve member (37) and cooperating with the valve member (37); It is arranged on the side of the return path forming yoke (27) facing the inflow pipe piece (11).

The hollow cylindrical magnet core (15) of the magnet casing (14) is located in the row of the valve member (37). For the purpose of adjustment, the magnet casing (14) is Can be fastened with screws. A valve closing spring (49) is supported by the magnet core (15). This valve closing spring is connected to the valve member (3) formed by the mover of the electromagnet (13). 7) is loaded in the closing direction (Fig. 1).

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Claims (1)

[Claims] 1. The fuel volatilized from the fuel tank of the internal combustion engine is supplied to the internal combustion engine through the intake pipe. A valve that meters and mixes the supplied fuel mixture, which is provided with a valve casing. and the valve casing is connected to the exhaust pipe piece of the fuel tank or is vaporized. a flowchart for connecting to an activated carbon reservoir downstream of said fuel tank for fuel The valve casing has an inlet pipe piece and an outlet pipe piece for connecting to the intake pipe. a seat valve disposed between the inlet tube piece and the outlet tube piece within the interior of the tube; , the seat valve has a valve seat having two seats surrounding an annular well opening, and cooperates with the valve seat. and an annular valve member that is moved in the valve closing direction by a valve closing spring. The valve is loaded and can be operated in the valve opening direction by an electromagnet, and the electromagnet is A pot-shaped magnet casing arranged coaxially with respect to the valve opening, and the magnet casing. A hollow cylindrical magnet core placed in the middle of the thing, and a magnet core and the magnet case. The excitation coil is fitted into an annular chamber between the magnet casing and the magnet casing. a return path forming yoke that serves as a bar; and a mover made of a magnetically permeable material that forms the valve member. In the type having a valve opening, the annular gap is connected to the return path forming yoke (27). The valve seat (32) with two seats is arranged as a valve nozzle (34). , is configured on the side of the return path forming yoke (27) facing the inflow pipe piece (11). , a hollow cylindrical magnet core (15) is provided at the bottom of the magnet casing (14). The movable member (37) is capable of being screwed onto the adjusting screw threads (19, 20), and Volatile device, characterized in that it supports a receiver (50) for a valve closing spring (49). A valve that meters and mixes emitted fuel into the fuel mixture of an internal combustion engine. 2. The annular gap nozzle (34) is provided on the return path forming yoke (27). The movable element (37) is placed at the bottom of the recess (33), and the mover (37) 2. The recess according to claim 1, wherein the recess is axially slidably guided in the recess at a distance. valve. 3. The mover (37) is attached to the leaf spring (3) which is tightened and fixed to the valve casing (10). 0), and the movable element (37) is caught in the recess (33). 3. The valve according to claim 2, wherein the leaf spring is configured to reliably prevent . 4. 3 . The leaf spring ( 30 ) is made of a non-magnetic material, for example bronze. Valve as described. 5. An axial passage (21) is provided between the magnet casing (14) and the valve casing (10). , 22), the axial passage being connected on the one hand to the inlet tube piece (11). and on the other hand, the return path forming yoke (27) is attached to the magnet casing (14). The inside of said magnet casing (14) via a flow opening (24) arranged near the 5. The valve according to claim 1, wherein the valve is connected to a valve. 6. an outflow pipe piece (12), and an outlet pipe piece (12) facing the outflow pipe piece of the return path forming yoke (27). A check valve (45) is arranged in the valve casing (10) between the side and the valve casing (10). A valve seat (44) is configured in the valve casing (10), and a valve member of the check valve (46) is controlled by the valve seat (47) supported by the outlet piece (12) 6. The valve according to claim 1, wherein the valve is pressed against 44).